US4729927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester packaging material
Assignee: Teijin Ltd
•
Filing: 1985-11-21
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Granted: 1988-03-08
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Expires: 2005-11-21
Abstract
Abstract A packaging polyester material comprising a polyethylene terephthalate component and a component of polyethylene isophthalate copolymerized with 5 to 60 mole % of an aliphatic hydroxycarboxylic acid having up to 8 carbon atoms. This packaging material is excellent in the resistance to the permeation of gases.
Inventors
- 👤 Masahiko Hirose
- 👤 Takatoshi Kuratsuji
- 👤 Toshihiro Santa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:34
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/36; B32B27/06; B32B27/08; C; C08; C08L; C08L67/00; C08L67/02; B32B2270/00; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/911; Y10S525/00; Y10S525/933; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
A polyester packaging material having excellent resistance to the permeation of gases, said material comprised of a polyethylene terephthalate component and a component of polyethylene isophthalate copolymerized with 5 to 60 mole% of an aliphatic hydroxycarboxylic acid having up to 8 carbon atoms and wherein the copolymerized polyethylene isophthalate component is present in such an amount that the content of the units of the aliphatic hydroxycarboxylic acid is 3 to 25 mole% based on the total polyester.
Claim 2
Dependent Claim
77 words
A polyester packaging material having excellent resistance to the permeation of gases, said material comprised of a polyethylene terephthalate component and a component of polyethylene isophthalate copolymerized with 5 to 60 mole% of an aliphatic hydroxycarboxylic acid having up to 8 carbon atoms and wherein the copolymerized polyethylene isophthalate component is present in such an amount that the content of the units of the aliphatic hydroxycarboxylic acid is 3 to 25 mole% based on the total polyester.
Claim 3
Dependent Claim
26 words
A packaging material as set forth in claim 1, wherein the polyethylene terephthalate component and the copolymerized polyethylene isophthalate component are formed into a multi-layer structure.
Claim 4
Dependent Claim
28 words
A packaging material as set forth in claim 1, wherein the polyethylene terephthalate component and the copolymerized polyethylene isophthalate component are blended and formed into an integral structure.
Claim 5
Dependent Claim
30 words
A packaging material as set forth in claim 1, wherein the content of the units of the aliphatic hydroxycarboxylic acid is 5 to 20 mole% based on the total polyester.
Claim 6
Dependent Claim
35 words
A packaging material as set forth in claim 1, wherein the aliphatic hydroxycarboxylic acid is selected from glycolic acid, 3-hydroxypropionic acid, 4-hydroxybutyric acid, 5-hydroxyvaleric acid, 6-hydroxycaproic acid, 7-hydroxyenanthic acid, 8-hydroxycarprylic acid and functional derivatives thereof.
Claim 7
Dependent Claim
17 words
A packaging material as set forth in claim 5, wherein the aliphatic hydroxycarboxylic acid is glycolic acid.
Claim 8
Dependent Claim
23 words
A packaging material as set forth in claim 1, wherein the copolymerization ratio of the aliphatic hydroxycarboxylic acid is 10 to 50 mole%.
Claim 9
Dependent Claim
22 words
A packaging material as set forth in claim 1, wherein the intrinsic viscosity of the polyethylene terephthalate component is 0.5 to 1.5.
Claim 10
Dependent Claim
22 words
A packaging material as set forth in claim 1, wherein the intrinsic viscosity of the polyethylene isophthalate component is 0.3 to 1.5.
References Cited (Backward Citations)
GB1507876A
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US4388456A
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JPS5939547A
Cited
US4403090A
Cited
EP0105825A2
Cited
EP0105826A1
Cited
US4482586A
Cited
JPS59196316A
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US4424242A
Cited
US4578437A
Cited
US4578295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |